Mohamed H. Dahab, Montasir A. Gafar and Abdul Gadir M. Abdul Rahman. Repair and Maintenance Cost Estimation for Two Agricultural Tractors as Affected by Hours of Use and Years in Dongola Area, Sudan. TIER-V8 [Internet]. 2022 Sep. 16 [cited 2026 Jun. 10];:113-27. Available from: https://stm.bookpi.org/TIER-V8/article/view/8257